A kangaroo is capable of jumping to a height of 2.62m. Determine the takeoff speed of the kangaroo.

The change in enthalpy of an incompressible substance with a density of 1000 kg/m³ that is isothermally compressed from 100 to 1000 kPa is 0 kJ/kg.

Enthalpy is a measure of the total energy of a thermodynamic system. In addition, it incorporates the energy that is supplied to the system as heat, as well as any energy that is used as work. Enthalpy is represented by the symbol H and is usually calculated in units of joules (J).

An incompressible substance is one that cannot be compressed or compressed to a significant degree. Liquids are examples of such materials. They are often described as having a constant density because, unlike gases, they do not easily change in volume in response to pressure or temperature changes. Therefore, the change in enthalpy is 0 kJ/kg.

Learn more about Enthalpy here: https://brainly.com/question/16985375.

#SPJ11

The energy of the incident electron is 26.3 keV. The energy is calculated from the conservation of energy which states that the initial energy is equal to the final energy of the electrons. Total energy is sum of kinetic energy and potential energy of the electrons.

The initial energy of the incident electron can be determined using the following equation:

[tex]E_{initial}= \Delta K + E_{final} + U[/tex]

where ΔK is the change in kinetic energy, [tex]E_{final}[/tex] is the final energy, and U is the potential energy.

Here, the second electron is initially at rest, and after the collision, the trajectories of the two electrons are at 90° to a uniform magnetic field. The magnetic force is perpendicular to the direction of motion, and hence, there is no work done. The potential energy U is, therefore, zero.

Initially, only the incident electron has energy, and hence, its initial energy is equal to its kinetic energy.

[tex]E_{initial} = \Delta K + E_{final}[/tex]

But, [tex]E_{final} = \frac{1}{2}mv_f^2[/tex]

Therefore,

[tex]E_{initial} = \Delta K + \frac{1}{2}mv_f^2[/tex]

The change in kinetic energy ΔK can be calculated using the following equation:

[tex]\Delta K = K_f - K_i[/tex]

But, [tex]K_i = \frac{1}{2}mv_i^2[/tex] where, [tex]v_i[/tex] is the initial velocity of the incident electron.

Therefore,

[tex]\Delta K = K_f - K_i= \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2[/tex]

Substituting the given values,

[tex]\Delta K = \frac{1}{2}(9.11 \times 10^{-31} kg)(4.24\times 10^5 m/s)^2 - \frac{1}{2}(9.11\times10^{-31} kg)(3\times10^8 m/s)^2\\= -4.22\times10^{-15} Joules[/tex]

The energy of the incident electron can be converted to keV by dividing it by the charge of an electron and then multiplying by 1000.eV .

Therefore,

[tex]E_{initial} = 4.22 \times 10^{-15} J / (1.602 \times 10^{-19} C/eV)\\ = 26.3 keV[/tex]

Thus, the energy of the incident electron is 26.3 keV.

For further detail on the kinetic energy, click on the following link:

https://brainly.com/question/18461965

#SPJ11

The factor that does not determine how much gravitational potential energy is in an object-earth system is the object's mass.

An object-earth system is a system in which an object interacts with the earth by exerting a force of attraction. The object's energy is derived from the work done by gravitational forces when the object is moved away from the earth's surface.

An object in an object-earth system's gravitational potential energy is the work done by gravitational forces on the object when it is moved from a lower position to a higher one in the object-earth system. The factor that does not determine how much gravitational potential energy is in an object-earth system is the object's mass. The gravitational potential energy of an object in the earth-object system is determined by the distance between the object and the earth's surface. The gravitational potential energy of an object increases as the distance between it and the earth's surface increases.

Learn more about the gravitational potential at brainly.com/question/19768887

#SPJ11

The coordinated functions of the Nervous, Endocrine, and Reproductive systems are:

Coordinated functions refer to the integration and communication between different organs, systems, and tissues in the body to achieve a common goal or purpose. In biological terms, coordinated functions often involve multiple physiological systems working together to maintain homeostasis, respond to stimuli, or carry out complex behaviors or processes.

Examples of coordinated functions include the regulation of blood glucose levels by the pancreas and liver, the coordination of movement by the nervous and musculoskeletal systems, and the release of hormones by the endocrine system to control various physiological processes.

Learn more on coordinated functions here: https://brainly.com/question/15686131

#SPJ1

The question is:

"COORDINATED FUNCTIONS OF THE NERVOUS, ENDOCRINE, AND REPRODUCTIVE SYSTEMS"

Directions: Identify the part of the brain that is involved in each situation below. Write only the letter of your answer.

A. Amygdala

B. Brocka's Area

C. Cerebellum

D. Cerebrum

E. Hippocampus

F. Occipital Lobe

G. Hippocampus

H. Hypothalamus

I. Inferior Colliculus.

J. Thalamus

K. Pons

L Superior Colliculus

M. Pineal Gland

N. Wernicke's Area

O. Pituitary Gland

1. "My heart tells me that you are the one. I love you so much!"

2. "IAOCEVOY! I don't know what that means. It's all Greek to me!"

3. "Chartreuse, Olive,Turquoise, and Mint are all shades of green."

4. "Janna always wakes up at 4 in the morning, regardless of whether she uses an alarm clock or not."

5. "I don't remember the way going to Myla's house. Can you accompany me there?"

6. Jenny's mother is about to give birth, she complains about contraction and pain usually when the baby is kicking

7. "Anthony is a very skilled dancer. He just won the school hip hop dance competition last week."

8. "As Nica was walking on the road she readily moved to the side for she heard an incoming ambulance"

9. "Elsa loves making faces whenever she talks to her friends."

10. "Ryan usually talks about how happy his high school days were to his grandchildren."

When one stationary object is replaced by another stationary object, the change between the two objects maybe perceived as the movement of a single object. This creates an optical illusion.

An optical illusion is defined as a visual phenomenon in which the information gathered by the eye is processed in a way that results in a false perception of reality or the visual impression of seeing something that is not present or incorrectly perceiving it. It is a misinterpretation of a visual stimulus caused by the brain's ability to misjudge sensory information.

It can happen when visual information is processed in the brain, and it can create an impression of movement that isn't there. This phenomenon occurs when an object is moving or when the eyes are moving around, but it can also happen when the object being looked at is stationary.

When one stationary object is replaced by another stationary object, the change between the two objects maybe perceived as the movement of a single object. This creates an optical illusion because the visual system is misled into thinking that the object is moving.

The brain continues to process visual information even when the object is stationary, creating the impression that the object is moving. This is why an optical illusion can be used to make a stationary object appear to move or to make a moving object appear to be stationary.

Learn more about optical illusion: https://brainly.com/question/3260067

#SPJ11

Exactly at noon, as determined by the WWV time signal, on successive days of a week the clocks according to their relative value as good timekeepers, best to worst.

Time signals are also used in many everyday applications, such as GPS navigation, where precise timing is essential for calculating positions accurately.  A time signal refers to any signal that provides information about the passage of time. Time signals are often used in experiments to measure the duration of events or to synchronize the timing of multiple processes.

One common type of time signal is a periodic signal, which repeats itself at regular intervals. This can be used to measure the period or frequency of a phenomenon, such as the oscillation of a pendulum or the vibration of a guitar string. Another type of time signal is a pulse signal, which provides a brief burst of energy at a specific time. This can be used to trigger the start or stop of a process or to measure the time delay between different events.

To learn more about Time signal visit here:

brainly.com/question/28875779

#SPJ4

The average density of the neutron star that has a mass of about 1.5Msun and a radius of 10 kilometers rounded off to two significant figures is 5.9 × 10¹⁴ kg/cm³

The average density of a neutron star can be calculated using the following formula;`d = (3M)/(4πr³)`where `d` is the average density of the neutron star, `M` is the mass of the neutron star, and `r` is the radius of the neutron star.Using the given values in the formula, we get;`d = (3 × 1.5 × 1.989 × 10³⁰)/(4π × (10 × 10³)³)` = 5.9 × 10¹⁷ kg/m³To convert kg/m³ to kg/cm³, we can use the following conversion factor;1 m³ = 10⁶ cm³Therefore,1 kg/m³ = 10⁻³ kg/cm³So, the average density of the neutron star in kg/cm³ is;`d = (5.9 × 10¹⁷) × (10⁻³)` = 5.9 × 10¹⁴ kg/cm³Therefore, the average density of the neutron star is 5.9 × 10¹⁴ kg/cm³ (rounded to two significant figures).Answer: 5.9 × 10¹⁴ kg/cm³.

More on density: https://brainly.com/question/15700804

#SPJ11

The electric potential energy, U, of two point charges is given by the equation, U = kq1q2/r where k is Coulomb's constant, q1 and q2 are the charges and r is the distance between the two charges. Now, let's solve the question using this equation. There are two charges, q1 and q2, and a parallel plate capacitor between them. The distance of q1 from the negative plate is s, and the distance of q2 from the negative plate is 2s. The charges have the same magnitude of charge, so let's assume q1 = q2 = q. Using the formula mentioned earlier, we get U1= kq^2/sU2= kq^2/2s. Therefore, the ratio of their potential energies is U2/U1= kq^2/2s / kq^2/sU2/U1= (kq^2/2s) × (s/kq^2)U2/U1= 1/2.

Therefore, the ratio of their potential energies is 1:2.

For more information regarding this topic, you can click the below link

https://brainly.com/question/14306881

#SPJ11

None of the answer options provided are correct as they all involve calculations that assume certain values for the pressure, volume, and temperature of the gas.

What is Constant Pressure?

Constant pressure is a thermodynamic process in which the pressure of a system remains constant during the process. This means that any change in volume or temperature of the system must be accompanied by a corresponding change in some other property, such as the amount of heat added or removed from the system.

Since the gas is compressed at a constant pressure, the work done on the system can be calculated as:

W = -PΔV

In this case, P is constant, so we have:

W = -P(V2 - V1)

W = -P(4 m^3 - 10 m^3)

W = -P(-6 m^3)

W = 6P m^3

Since we are not given any information about the type of gas or its properties, we cannot use the ideal gas law to calculate the pressure P. Therefore, we cannot determine the exact value of the work done on the system.

Learn more about Constant Pressure from given link

https://brainly.com/question/2139620

#SPJ1

a) The magnetic field at the center of loop 20.0 cm in diameter carrying is equals to the 2.8274×10⁻⁵ T.

b) Smallest magnetic field that change measured value by 0.0100% is equals to the 2.8274×10⁻⁹ T.

We know that moving charges create magnetic fields and magnetic fields exert forces on moving charges, devices that are used to measure field strengths. Consider the wire segment present in above figure.

A) Diameter of wire segment, d = 20 cm or 0.2 m carrying current I = 4.5 A

Magnetic Field at the center of current loop of segment, B= μ₀I/d

= 4π×10⁻⁷×4.5/0.2

= 2.8274×10⁻⁵ T

Therefore magnetic Field at the center of current loop 2.8274×10⁻⁵ T.

B) Current in carrying wire, I = 4.5 A

The field should be less than the measured field by 0.0100%. So, smallest field that change measured value by 0.0100% = 0.0100% of 2.8274×10⁻⁵ T

= 2.8274×10⁻⁹ T

Therefore Smallest field that change measured value by 0.0100% = 2.8274×10⁻⁹ T

For more information about magnetic field, visit :

https://brainly.com/question/26257705

#SPJ4

Complete question:

The above figure completes the question.

Since moving charges create magnetic fields and magnetic fields exert forces on moving charges, devices that are used to measure field strengths often affect the system they are being used to measure. Consider the wire segment in the figure, which is used to measure the magnetic field by determining the foree exerted on the current flowing through it. Part (a) Estimate the field the loop creates by calculating the field strength, in teslas, at the center of a circular loop 20.0 cm in diameter carrying

Part (b) What is the smallest field strength this loop can be used to measure with a 4.5 -A current, if its field should alter the measured field by 0.0100% or less?

A student must analyze data collected from an experiment in which a block of mass 2M traveling with a speed vo collides with a block of mass M that is initially at rest. After the collision, the two blocks stick together. Thus, the correct options are A and B.

The initial momentum of the system = the momentum of block 1 = (2M)vo. The final momentum of the system = the momentum of the combined blocks = (2M + M)uf = 3Muf. Therefore, the correct applications of the equation for the conservation of momentum that represent the initial and final momentum of the system for a completely inelastic collision between the blocks are:

2Mo = 3Muf, because the blocks stick together after the collision. 3Mvo = 3MUf, because the blocks stick together after the collision.

Therefore, the correct options are A and B.

Learn more about Momentum here:

https://brainly.com/question/30677308

#SPJ11

The statements that correctly describe the processes occurring in the flask  are A and B. C and D are incorrect statetment.

a) States that the relative amounts of liquid and vapor in the flask remain constant, which is true as equilibrium has been reached, meaning that the rate of evaporation equals the rate of condensation. b) states that molecules are leaving and entering the liquid phase at the same rate, which is also true as equilibrium has been reached.

c) and d) are incorrect because they do not accurately describe the processes occurring in the flask; while the system is at equilibrium, it is still in a state of change with molecules leaving and entering the liquid phase at the same rate.  

Learn more about term of equilibrium: brainly.com/question/517289

#SPJ11

Each tic mark indicates a time period of 9 seconds if the scale on the horizontal axis has a division of 9 seconds. As a result, the third tic point on the horizontal axis would denote the following period of time:

3 x 9 s = 27 s

Hence, 27 seconds are indicated by the third tic point on the horizontal axis.

It is true! The third tic point would represent three times nine seconds, or 27 seconds, as each tic mark on the horizontal axis denotes a time interval of nine seconds.Each tic mark indicates a time period of 9 seconds if the scale on the horizontal axis has a division of 9 seconds. As a result, the third tic point on the horizontal axis would denote the following period of time:Hence, 27 seconds are indicated by the third tic point on the horizontal axis.

learn more about horizontal axis here:

https://brainly.com/question/29774083

#SPJ4

The potential energy of the ball at this point is maximum as the ball has the highest height at this point.
The momentum of the ball at this point is given by the product of mass and velocity. As the velocity of the ball is zero, its momentum is also zero.
Momentum = 0, KE = 0, PE > 0
Hence, the ranks of quantities at each point are as follows:
A) C, B = D, A
B) C, B = D, A
C) A, B = D, C

The ball is at rest at the left of the metal track. It is assumed to have enough friction to roll, but not enough to reduce its speed. In this question, we have to rank the quantities from the greatest to the least at each point. Given below are the quantities that are to be ranked,

a) Momentum,

b) KE,

c) PE.
Rank of quantities at each point:
At point A: Here, the ball has the maximum height. It is at rest at this point. At this point, the ball has the highest potential energy, PE.
PE>KE=0
The velocity of the ball at this point is zero. Hence, the kinetic energy of the ball is zero.
The momentum of the ball is given by the product of mass and velocity. As the velocity of the ball is zero, its momentum is also zero.
Momentum = 0, KE = 0, PE > 0
At point B: At this point, the ball has converted some of its potential energy into kinetic energy. The ball has lost some of its height, and hence, its potential energy.
[tex]PE>BKE, KE>BPE[/tex]
As the ball is moving, it has some velocity. Hence, it has kinetic energy.
The momentum of the ball at this point is given by the product of mass and velocity. As the velocity of the ball is non-zero, its momentum is also non-zero.
Momentum > 0, KE > 0, PE < 0
At point C: At this point, the ball has lost all its potential energy, and all of it is converted into kinetic energy.
[tex]KE>CPE, PEC=0[/tex]
The velocity of the ball is the highest at this point. Hence, the kinetic energy of the ball is the highest at this point.
The momentum of the ball at this point is given by the product of mass and velocity. As the velocity of the ball is the highest at this point, its momentum is also the highest.
Momentum > 0, KE > 0, PE = 0
At point D: At this point, the ball has lost all its kinetic energy due to friction. Hence, it comes to rest at this point.
KE=0, PED>0

for such more questions on momentum

https://brainly.com/question/1042017

#SPJ11

Water slows down neutrons that are leaving nuclear processes quickly. As the water warms up, steam is produced. Electricity is generated by the turbine that the steam turns.

learn more about electricity here

https://brainly.com/question/776932

#SPJ1

The rock will be 12 meters from the ground level after it has been thrown upward with a velocity of 12 meters per second from the top of the 42 meter high cliff for a total of 3.5 seconds.

The cliff is the height that generally has the highest height and it can be mountains, stones, buildings.

This is because the total time taken for the rock to fall back down will be the same as the total time taken for the rock to reach the top of the cliff. The equation used to calculate this is: time = distance / velocity. Therefore:

Time = 42 meters (cliff height) / 12 meters per second (velocity) = 3.5 seconds.

So, the rock will be 12 meters from the ground level after 3.5 seconds.

Read more about cliff here:

https://brainly.com/question/22789028

#SPJ11

Answer: Noble Gases (Blue)

True. A Faraday bag (also known as an electromagnetic bag) is a container made from metal or a special material that blocks any electromagnetic emanations from passing into or out of the bag, preventing a mobile device from communicating with the outside world.

This is because Faraday bags are electromagnetic bags that are designed to isolate electronic devices from external electromagnetic influence. They are also known as radiofrequency shielding bags, Faraday cage bags, signal blocker bags, or electromagnetic pulse (EMP) bags.

What are Faraday bags?

Faraday bags are made of a combination of metal or metal-coated fabrics that are designed to block electromagnetic signals from entering or leaving the bag. They are usually used to keep mobile devices such as smartphones and tablets from communicating with the outside world, especially in situations where an individual is worried about their privacy or security. They are also used by law enforcement agencies to prevent suspects from remotely wiping or deleting evidence on their devices.

How do Faraday bags work?

Faraday bags work by using a principle known as the Faraday effect, which states that any electric field in a conductor is shielded from the conductor's interior by the presence of an electric field. Faraday bags use this principle to block incoming and outgoing signals by creating an electrically conductive enclosure around the device. This means that when a mobile device is placed inside a Faraday bag, the bag acts as a Faraday cage, which shields the device from electromagnetic radiation. As a result, the device cannot communicate with the outside world.

For further details about Faraday bag, click on the below link:

https://brainly.com/question/23083952

#SPJ11

When 872.0 kJ of thermal energy are injected, the temperature of the 25 kg of water in the car's cooling system changes by 35.0 degrees Celsius.

Water's specific heat capacity (J/(gK), or 4,180 J/ (kgK). Thus, we can use the following formula to get the temperature change:

Q = mcΔT

where Q is the extra thermal energy (872 000 J), m the water mass (25 kg), c the water's specific heat capacity (4,180 J/(kg*K)), and T the temperature change.

When we solve for T, we get:

The equation T = Q/(mc) Equals 872,000 J/(25 kg * 4,180 J/(kgK)) = 35.0 °C.

When 872.0 kJ of thermal energy are injected, the temperature of the 25 kg of water in the car's cooling system changes by 35.0 degrees Celsius.

learn more about energy here:

https://brainly.com/question/1932868

#SPJ4

The average arterial pressure in your hands when they are held at your side is 47.5 mmHg.

The average arterial pressure in your hands when they are held at your side can be determined using the hydrostatic pressure formula, which is a function of height, gravity, and density. When the hands are held at the side, they are 60 cm below the heart, which means they are at a distance of 0.6 m.

The hydrostatic pressure formula is given by

P = ρgh

Where,

P is the pressure, ρ is the density, g is the acceleration due to gravity, and h is the height. We can assume that the density of blood is constant, and we can take the value of g to be 9.81 m/s², the standard acceleration due to gravity.

Therefore, the pressure at the heart is 100 mmHg, or 100/760 = 0.131 atm. The pressure in the hands can be calculated as follows:

P = ρghP = (1.06 × 10³ kg/m³) × (9.81 m/s²) × (0.6 m)

P = 6.26 × 10³ N/m²

P = 6.26 × 10³ Pa

P = 47.5 mmHg

Therefore, the average arterial pressure in the hands when they are held at the side is 47.5 mmHg.

Learn more about hydrostatic pressure at https://brainly.com/question/28206120

#SPJ11

Rutherfordium is a synthetic element with the atomic number 104 and symbol Rf. As a synthetic element, it is not found naturally on Earth and is produced through nuclear reactions in laboratories.

Rutherfordium is a member of the transition metals group and is expected to have similar physical and chemical properties to its neighboring elements in the periodic table. However, due to its radioactive nature and short half-life, its physical properties are difficult to determine.

While there is no experimental data available on the state of matter of rutherfordium at room temperature, it is expected to be a solid metal, similar to other transition metals, such as copper or nickel.

To learn more about matter refer to:

brainly.com/question/28591826

#SPJ4

In the heliocentric model of the solar system, one planet passing another in its orbit gives rise to gravitational forces.

It can also lead to an alteration in the planets' orbits. This is due to the gravitational forces produced by the interaction between the planets. A heliocentric model is a model of the solar system in which the sun is at the center and the planets orbit it. This model was first proposed by Nicolaus Copernicus, a Polish astronomer in the 16th century. He proposed this model after observing that it better explained the motions of the planets than the previous geocentric model, in which Earth was at the center and everything else revolved around it. An orbit gives rise to the gravitational force that causes a planet to continue to travel in a circle around the sun. It is also responsible for the gravitational pull between planets, which affects their orbits. A planet passing another planet in its orbit can also cause some gravitational perturbations in its orbit. This can lead to an alteration in the planets' orbits or cause their orbits to change slightly over time. The heliocentric model is currently the widely accepted theory of how our solar system is arranged. It states that the planets orbit the sun, which is a massive ball of hot gas at the center of the solar system. The sun's gravity is what keeps the planets in their orbits.

Learn more about the heliocentric model  at brainly.com/question/19757858

#SPJ4

Answer:

To make it around the circle, the tension in the string must provide the necessary centripetal force to keep the ball moving in a circle. At the top of the circle, the tension in the string must provide all the force to keep the ball moving in a circle. At the bottom of the circle, the tension in the string must provide the centripetal force in addition to the force of gravity.

We can use the centripetal force formula to solve for the minimum velocity: F_c = m * a_c

where F_c is the centripetal force, m is the mass of the ball, and a_c is the centripetal acceleration.

At the top of the circle, the centripetal force is equal to the tension in the string: F_c = T

where T is the tension in the string.

At the bottom of the circle, the centripetal force is equal to the sum of the tension in the string and the force of gravity:

F_c = T + mg

where m is the mass of the ball, g is the acceleration due to gravity (9.8 m/s^2), and T is the tension in the string.

The centripetal acceleration is given by: a_c = v^2 / r

where v is the velocity of the ball and r is the radius of the circle.

Since the circle has a radius of 0.33 m, we can substitute this into the equation for a_c: a_c = v^2 / 0.33

Combining these equations, we get:

At the top of the circle: T = m * v^2 / 0.33

At the bottom of the circle: T + mg = m * v^2 / 0.33

We can solve for the minimum velocity by using these two equations to eliminate the tension in the string: m * v^2 / 0.33 + mg = m * v^2 / 0.33

Simplifying this equation, we get: v = sqrt(0.33 * g)

Plugging in the values, we get: v = sqrt(0.33 * 9.8) = 1.81 m/s

Therefore, the minimum velocity that the ball must have to make it around the circle is 1.81 m/s

Plants help to reduce water runoff and soil erosion, both of which affect the health of streams and rivers by impacting water quality.

Soil erosion increases the silt load in the water, which can smother living organisms, particularly plants and invertebrate species. Runoff water can carry pollutants, particularly pesticides, and herbicides from agricultural land.

Landscape 1 (streams cutting through small farms with a variety of crop types and natural vegetation buffers between the fields and the streams) would be the best quality, followed by Landscape 2 (a large floodplain area covered in lowland forests and swamps full of emergent vegetation, with small streams cutting through the area) and Landscape 3 (an urban housing development where the streams are surrounded by emergent vegetation).

Learn more about water quality at  brainly.com/question/20848502

#SPJ11

At the shop, Joselyn purchased 2700 grammes of salt water taffy.

To convert kilograms (kg) to grams (g), Joselyn would need to multiply the weight in kilograms by 1000. This is because there are 1000 grams in 1 kilogram. Therefore, to find out how many grams of salt water taffy Joselyn bought, she would need to multiply 2.7kg by 1000.

The correct answer is (B) Multiply by 1000.

Multiplying 2.7kg by 1000 gives:

2.7kg x 1000 = 2700g

So Joselyn bought 2700 grams of salt water taffy at the store.

To learn more about salt water refer to:

brainly.com/question/6829606

#SPJ4

Answer:

8.04 seconds

Explanation:

Assuming that the child starts from rest at the bottom of the hill and travels until she comes to a stop, we can use the following kinematic equation:

v_f^2 = v_i^2 + 2ad

where v_f is the final velocity (which is zero since the child comes to a stop), v_i is the initial velocity (which is the velocity at the bottom of the hill), a is the acceleration (-0.392 m/s²), and d is the distance traveled.

We can solve for d:

d = (v_f^2 - v_i^2) / (2a)

= (0 - v_i^2) / (2-0.392)

= v_i^2 / 0.784

Since the child is sliding along flat snow-covered ground, there is no change in elevation, so we can use the distance traveled from the bottom of the hill to the stopping point as the distance d.

To find the time it takes for the child to travel this distance, we can use the following kinematic equation:

d = v_it + 0.5a*t^2

where t is the time and all other variables are as previously defined.

Substituting the expression for d obtained above, we get:

v_i^2 / 0.784 = v_it + 0.5(-0.392)*t^2

Solving for t, we get:

t = (2 * v_i) / 0.392

We still need to find the value of v_i, the initial velocity of the child at the bottom of the hill. To do so, we can use conservation of energy. The child starts at rest at the top of the hill, so all the initial energy is potential energy. At the bottom of the hill, all the potential energy has been converted to kinetic energy. Assuming no energy is lost to friction, we can equate these two energies:

mgh = 0.5mv_i^2

where m is the mass of the child, g is the acceleration due to gravity (9.8 m/s²), and h is the height of the hill.

Solving for v_i, we get:

v_i = √(2gh)

Substituting this expression for v_i into the expression for t obtained earlier, we get:

t = (2 * √(2gh)) / 0.392

Plugging in the values of g, h, and a, we get:

t = (2 * √(29.820)) / 0.392 = 8.04 seconds

Coordinate , A - the height of the stone when it hits the water. A slingshot sends a stone vertically upward from a height of 20 feet above a pool of water.

The coordinate A represents the height of the stone when it hits the water. When the stone hits the water, its height above the water surface is zero.

So, we can set the expression for the stone's height equal to zero and solve for t to find the time when the stone hits the water. The height of the stone when it is launched is given as 20 feet, which is a fixed value in this problem.

The time when the stone is launched is also a fixed value, which is zero. The maximum height of the stone is the highest point the stone reaches above its initial height of 20 feet. The time when the stone reaches its maximum height is the time at which the vertical velocity of the stone becomes zero.

To know more about vertical velocity , visit :

https://brainly.com/question/11679227

#SPJ1

At a given pressure, a substance in the saturated vapor phase will be at a lower temperature than a superheated vapor.

Saturated vapor refers to the state of a material in which it contains a maximum quantity of vapor that is uniformly blended with the liquid or solid state of the same chemical composition at a specified temperature and pressure.

A superheated vapor is a vapor that is heated beyond its boiling point or saturation temperature for its pressure. As a result, it will not condense back into a liquid phase until it has cooled sufficiently. As a result, it's simply vapor, with no liquid portion to it.

According to Charles's law, if the pressure of a gas is kept constant, the volume of the gas varies directly with the temperature. If pressure remains constant and temperature increases, the volume of a substance expands, indicating that molecules are gaining energy and colliding with one another more frequently. As a result, the kinetic energy of the system increases. When a substance is in a superheated vapor state, it is at a higher temperature than when it is in a saturated vapor state at the same pressure.

Learn more about saturated vapor phase here: https://brainly.com/question/13407628

#SPJ11

Answer: The model star/planet would have to be 1,000 km away from the next closest star.

Explanation:
We need to find out the distance required for the distances in the system to be in scale.

Let's use the proportion to solve the problem:

1 m/4 × 10⁷ km = x/4 × 10¹³ km

Where x is the distance required for the distances in the system to be in scale.

Cross-multiply: 4 × 10¹³ km × 1 m = 4 × 10⁷ km × x

Simplify: 4 × 10¹³ m = 4 × 10⁷ x

Divide both sides by 4 × 10⁷ :1 × 10⁶ = x

Therefore, the distance required for the distances in the system to be in scale is 1 × 10⁶ m or 1,000 km.

So the model star/planet would have to be 1,000 km away from the next closest star.

Learn more about distance here

https://brainly.com/question/26550516

#SPJ11